package com.lyd.management.filter;

import com.alibaba.fastjson.JSON;
import com.lyd.management.common.R;
import com.lyd.management.common.Utils;
import com.lyd.management.redis.RedisCache;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;


/**
 * 检查用户是否已经完成登录
 */
//@Component
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    private static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    // 不需要处理的路径列表
    private static final String[] urls = new String[]{
            "/user/login",
            "/user/doLogin",
            "/user/register",
            "/pay",
            "/create",
            "/file/upload"
    };

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        log.info("开始启动登录过滤器");
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        // 获取本次请求的URI
        String requestURI = request.getRequestURI();// /backend/index.html
        log.info("拦截到请求：{}", requestURI);

        // 判断本次请求是否需要处理
        // 如果不需要处理，则直接放行
        if (check(requestURI)) {
            log.info("本次请求{}不需要处理", requestURI);
            filterChain.doFilter(request, response);
            return;
        }

        // 获取redis中保存的用户id
        String currentUserId = Utils.getCurrentUserIdByRequest(request);
        // 判断登录状态，如果已登录，则直接放行
        if (currentUserId != null) {
            log.info("用户{}已登录，允许请求", currentUserId);
            filterChain.doFilter(request, response);
            return;
        }


        log.info("用户未登录");
        //5、如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOT LOGIN")));
    }

    /**
     * 路径匹配，检查本次请求是否需要放行
     */
    public boolean check(String requestURI) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) {
                return true;
            }
        }
        return false;
    }
}
